Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Derivatives (Derivatives Gains and Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest rate component of debt - not accounted for as a hedge \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on commodity derivatives included in Cost of sales and merchandising revenues	$ 1,939	$ 4,236	$ 5,417
Interest rate component of debt - not accounted for as a hedge \| Interest rate contract \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on commodity derivatives included in Cost of sales and merchandising revenues	(718)	1,115
Interest rate component of debt - not accounted for as a hedge \| Foreign Exchange Contract \| Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on commodity derivatives included in Cost of sales and merchandising revenues	(437)	(1,548)
Interest rate component of debt - accounted for as a hedge \| Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate derivative gains (losses) included in Other comprehensive income	12,398	168
Interest rate component of debt - accounted for as a hedge \| Interest rate contract \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate derivative gains (losses) included in Interest income (expense)	$ (761)	$ 158